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Old 07-19-2013, 12:59 PM   #1
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Radiator flush and seafoam

Hey all I have a 92 yj Inl6 I really need to flush the whole system 1st question is there coolant overflow valves on the block and if so how many and where are they?, I cant find them and do I really need to crack em open??, once i open the bottom drain on Radiator do i run the jeep for a spell to pump out old water? or just start flushing and hoseing the radiator out.

Question 2 on a old 92 is seafoaming a gamble considering its 22 yrs old and no telling what kind of garbage it will brk up in the fuel system and inside the powerplant? I just dont want to open a can of worms here and screw stuff up, shld I seafoam the cooling system before flushing as well??. Thanx in adv..

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Old 07-19-2013, 01:14 PM   #2
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I would drain as much as you can with even pilling he lower radiator hose. Then fill with water only run for a few minutes and drain again. Do this until its clean water at best. Then refill with 50/50. Seafoam the engine and fuel system may brake up some stuff but if you do run it in the oil only do a few minutes. Then drain and replace filter and oil.

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Old 07-19-2013, 02:25 PM   #3
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Sounds good so you are saying that there is no need to open the block overflows? and just disconnect the bottom hose on radiator and drain rinse repeat?
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Old 07-19-2013, 02:45 PM   #4
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Originally Posted by yj-onthecape View Post
Sounds good so you are saying that there is no need to open the block overflows? and just disconnect the bottom hose on radiator and drain rinse repeat?
Yes, not totally sure what you mean by block overflows? But this would be easier I think. Just drain and hook it all back up fill with water and repeat.
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Old 07-19-2013, 02:55 PM   #5
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Coolant over flows are little valves on the engine block that u can open when refilling a engine with fresh coolant it ensures that there is no air trapped inside as air will reside out of fluids ) when u see pure flow of coolant comeing out of overflow you shut them, I just cant find them.
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Old 07-19-2013, 03:23 PM   #6
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Yea I'm pretty sure mine doesn't have any. Good luck finding them. The only engines I've seen them on is big Diesel engines. But never called them overflows. They were always block drains to me but tomato-tamato.

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